Polyimide, producing method of imide compound, and producing method of recycled polyimide

Abstract

A polyimide includes a non-crosslinked structure including a main chain. The main chain includes a Si—O—C bond. The main chain may include a C—O—Si—O—C bond. The main chain includes, for example, a group denoted by —OSi(R1)(R2)O—. At least one oxygen atom included in the group bonds to, for example, a carbon atom adjacent to the group to form the Si—O—C bond.

What is claimed is: 
     
         1 . A polyimide comprising:
 a non-crosslinked structure including a main chain,   wherein the main chain includes a Si—O—C bond.   
     
     
         2 . The polyimide according to  claim 1 ,
 wherein the main chain includes a C—O—Si—O—C bond.   
     
     
         3 . The polyimide according to  claim 1 , wherein
 the main chain includes a group denoted by —OSi(R 1 )(R 2 )O—,   at least one oxygen atom included in the group bonds to a carbon atom adjacent to the group to form the Si—O—C bond, and   in the group, R 1  and R 2  each independently include at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I.   
     
     
         4 . The polyimide according to  claim 1 , wherein
 the non-crosslinked structure includes a first constitutional unit denoted by Formula (A1),   
       
         
           
           
               
               
           
         
         in Formula (A1),
 R 1  and R 2  each independently include at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I, 
 X and Y each independently represent a divalent group including at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I, 
 Z represents a tetravalent group including at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I, and 
 
         at least one selected from the group consisting of X and Y includes a carbon atom that bonds to an adjacent oxygen atom to form the Si—O—C bond. 
       
     
     
         5 . The polyimide according to  claim 1 , wherein
 the non-crosslinked structure includes a second constitutional unit denoted by Formula (A2),   
       
         
           
           
               
               
           
         
         in Formula (A2),
 R 1  to R 10  each independently include at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I, and 
 Z represents a tetravalent group including at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I. 
 
       
     
     
         6 . The polyimide according to  claim 1 , wherein
 the non-crosslinked structure includes a third constitutional unit denoted by Formula (A3),   
       
         
           
           
               
               
           
         
         in Formula (A3), R 1  to R 12  each independently include at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I. 
       
     
     
         7 . The polyimide according to  claim 1 , wherein
 the non-crosslinked structure includes a fourth constitutional unit denoted by Formula (A4),   
       
         
           
           
               
               
           
         
         in Formula (A4), R 1  to R 10  and R 13  to R 18  each independently include at least one atom selected from the group consisting of H, C, N, O, S, F, Cl, Br, and I. 
       
     
     
         8 . The polyimide according to  claim 3 ,
 wherein R 1  and R 2  each independently represent a hydrogen atom or a hydrocarbon group having a carbon number of greater than or equal to 1 and less than or equal to 6.   
     
     
         9 . A polyimide comprising:
 a main chain including a Si—O—C bond,   wherein a ratio of the number of silicon atoms included in the main chain to the number of imide groups included in the main chain is greater than or equal to 2% and less than or equal to 50%.   
     
     
         10 . The polyimide according to  claim 1 ,
 wherein a weight average molecular weight is greater than or equal to 1,000.   
     
     
         11 . A producing method of an imide compound, the producing method comprising:
 bringing the polyimide according to  claim 1  into contact with a fluorine-containing compound, and   obtaining an imide compound that is a decomposition product of the polyimide by reacting the polyimide with the fluorine-containing compound.   
     
     
         12 . The producing method according to  claim 11 ,
 wherein the fluorine-containing compound includes a fluoride salt.   
     
     
         13 . The producing method according to  claim 12 ,
 wherein the fluoride salt includes tetrabutylammonium fluoride.   
     
     
         14 . A producing method of a recycled polyimide, the producing method comprising:
 obtaining a decomposition product of the polyimide according to  claim 1  by decomposing the polyimide, and   synthesizing a recycled polyimide by using the decomposition product.